Pipe or tube making



July' 25, 1939- E. J. NovAcK 2,167,424

PIPE 0R TUBE MAKING Filed March 29, 1938 3 Sheets-Sheet 2 medo:

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July 25, 1939. E, J, NOVACK 2,167,424

' PIPE on TUBE MAKING Filed March 29, 1938 3 Sheets-Sheet 3 FIGB- l y/ l5 /l/J v/ @/Z i f,

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EDWED J No1/KICK,

Patented July 25, 1939 PATENT oFFlcE PIPE on. TUBE MAKING Edward J. Novack, .McKeesport, Pa., assigner to National Tube Company, a corporation of New Jersey Application March 29, 1938, Serial No. 198,784

3 Claims.

axial rolling process the need for lubricating theinterior surface of the Wall of said work-piece during its formation, at-the surfaces of contact between the mandrel-plug and the work-piece, `is Well known. I have found that the best method of such lubrication is by depositing a lm of carbon by the partial combustion of a solid orv liquid material containing carbon, such as oil or coal dust. This'can be effected in the working zone of the mill, as there is not sufficient oxygen to permit complete combustion of the oil or other lubricant used although the temperature is very high.

It is accordingly an object of the present invention to provide an improved apparatus for lubricating the mandrel-plug of a pipe or tube mill.

It is another object of the present invention to 25 provide an improved apparatus for lubricating the piercing-point of -a pipe or tube mill.

.It is afurther object of my invention to provide an improved apparatus of the class described which is Vcontinuous and automatic.

The foregoing and further objects will be appare'nt after referring to the drawings, in which:

Figures 1 and 1 are composite longitudinal sectional elevations of the apparatus of the invention;

Figure 2 is an enlarged fragmentary sectional view of part of the apparatus of Figure 1;

Figure 3 is a fragmentary sectional view of the apparatus oi' my invention operating on a previously pierced or hollow billet; and

Figure 4 is a fragmentary sectional view of the apparatus of my invention as used for reeling aipreviously pierced and elongated tubular workp ece. In the drawings the letter A designates a pair 45 to pierce and elongate a billet B by drawing it over the mandrel-plug or piercing-point C of the apparatus of my invention. 'I'he numeral 2 designates a mandrel-bar having a bar-cap 3 at its outer end. Disposed on the bar-cap 3 is the piercing-point C. This piercing-point C has a bore 5 therein extending from the rear thereof to a point adjacent the tip 6, and may have a chamber 1 therein. A recess V8 around the periphery of said'piercing-point is provided adof power-actuated metal-working rolls adapted jacent the tip 6 and communicates with the bore 5 by means of ports 9 so that a lubricant supplied to the piercing-point C will be delivered through the bore 5 and ports 9 tov the inner surface of the billet B and the exterior of the piercing- 5 point.

The piercing-point C is reciprocabiy disposed on the forwardly extending portion I I of the barcap 3 and has a rearwardly extending central portion I2 adapted to extend into the bore I4 10 of the bar-cap 3, the bore providing, at this point, a valve chamber I5. Within the valve chamber I5 there is disposed a valve I6 and its spring I'i which normally holds the valve in closedposition against the valve-seat I8. When in this position the piercing-point C is pushed forwardly by reason of the engagement of the valve I6 with its rearwardly extending central portion I2.

Concentrically disposed Within the vmandrel- 4bar 2 are telescoped pipes I9 and 20. The inner pipe I9 is in communication with the bore I 4 in the bar-cap 3 and the outer pipe 20 is open at its forward end, as shown at 2I. The rear end 22 of the mandrel-bar 2 is connected by a coupler 25 25 to a thrust-spindle 26 disposed Within a thrust-bearing 21, the latter being secured Within a housing 28 in the mandrel-bar carriage 3l). 'I'he mandrel-bar carriage 30 is held in its Working position by the usual latch 3l and is mov- 30' @able toward and away from the metal-working rolls A in the conventional manner by means of a cable .32.

The concentrically disposed telescoped pipes I9 and 29 extend through the coupler 25 and the 35 thrust-spindle 26. The inner pipe i9 is connected to a supply 3 5 of lubricant 36 which is under pressure. The outer pipe 20 is connected to a suitable source of cooling fluid to deliver said fluid to the interior of the mandrel-bar 2. 40

This uid is exhausted from the interior of the mandrel-bar 2 around pipe 20 through the outlet 38.

According to the foregoing, it will be seen that, in operation, the lubricant 36 is delivered under 45 pressure through the pipe I9 and thence through the bore I4 to the valve chamber I5. When the billet Bis forced into contact with the piercing-point C it opens the valve I6 by reason of.

the engagement of the rearwardly extending cenl tral portion I2 of the piercing-point with the .valve I6, thereby permittingvthe lubricant to ilow into the recess 9 and, by .reason oi' the high temperature of the billet and the lack of oxygen, incomplete combustion takes places, there- 56 by depositing a. illm of carbon on the inner surface of the billet B. When the billet B has entirely passed over the piercing-point C the supply of lubricant to the point will be automatically shut off by the valve-spring Il forcing the piercing-point C forwardly and closing the valve In Figures 3 and 4, I have shown the application of the apparatus o my invention to the .second-piercing and reeling" operations, re-

spectively. As shown in Figure 3, a previously pierced or hollow billet B is subjected to further substantial wall reduction while in Figure 4, a previously pierced and elongated work-piece B is being reeled"`i. e. subjected to a wall smoothing operation without any substantial Wall reduction. The mandrel-plug C and the balance of the apparatus is substantially the same as previously described.

While I have shown and described a specic embodiment of mv invention, it will be understood that I do not wish to be limited exactly thereto, since various modifications may be. made without departing from the scope of my invention, as dened by the following claims.

I claim:

1. In a. pipe or tube mill, a mandrel-bar, a mandrel-plug reciprocably mounted on the forward end of said mandrel-bar, said mandrel-bar having a valve chamber in its forward end, a valve in said valve chamber, said valve being normally spring-biased into closed position, an extension on the r'ear of said mandrel-plug which is operable to open said valve by the feeding movement of a work-piece into the mill, a tube extending through said mandrel-bar and opening into said valve chamber, said mandrel-plug having a bore in communication with said valve chamber when said valve is in open position, the tip of said mandrel-plug having at least one passageway extending from said ,bore to its pe riphery, and means for delivering a lubricant to said tube.

2. In a pipe or tube mill, a mandrel-bar, a tapered mandrel-plug reciprocably mounted on the forward end of said mandrel-bar, said mandrel-bar having a valve chamber in its forward end, a valve in said valve chamber, said valve being normally spring-biased into closed position, an extension on the rear of said tapered mandrel-plug which is operable to open said valveby the feeding movement of a billet into the mill, a tube extending through said manldrel-bar and opening into said valve chamber,

said tapered mandrel-plug having a bore in communication with said valve chamber when said valve is in open position, the tip of said tapered mandrel-plug having at least one passageway extending from said bore to its periphery, and means for delivering a lubricant to said tube.

3. In a pipe or tube mill, a mandrelbar, a mandrel-plug reciprocably mounted on the forward end of said mandrel-bar, said mandrel-bar having a passageway, means for delivering a lubricant to the passageway cf said mandrel-bar, said mandrel-plug having a passageway which communicates with the passageway of said mandrel bar and extends to the periphery of said mandrel-plug, and means for controlling the ow of lubricant through the passageway of said mandrel-plug, said means being operable by the reciprocation of said mandrel-plug on the forward end of said mandrel-bar.

, l@WARD J. NOVACK. 

